22521424 has 20 divisors (see below), whose sum is σ = 43813044. Its totient is φ = 11214848.

The previous prime is 22521409. The next prime is 22521431. The reversal of 22521424 is 42412522.

It can be written as a sum of positive squares in 2 ways, for example, as 22391824 + 129600 = 4732^2 + 360^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22521395 and 22521404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1374 + ... + 6850.

Almost surely, 2^22521424 is an apocalyptic number.

It is an amenable number.

22521424 is a deficient number, since it is larger than the sum of its proper divisors (21291620).

22521424 is a wasteful number, since it uses less digits than its factorization.

22521424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5742 (or 5736 counting only the distinct ones).

The product of its digits is 1280, while the sum is 22.

The square root of 22521424 is about 4745.6742408218. The cubic root of 22521424 is about 282.4003835994.

Adding to 22521424 its reverse (42412522), we get a palindrome (64933946).

The spelling of 22521424 in words is "twenty-two million, five hundred twenty-one thousand, four hundred twenty-four".